Answers/Solutions to Exercises in Chapter 4, Exercise 4
E4: What is wrong with the following program?
#include <stdio.h>
int main()
{
char* p;
p = realloc(p,100);
strcpy(p,"hello");
p = realloc(p,200);
strcat(p," and good bye");
return 0;
}
A4: p is not initialized, so when first used in realloc(), all problems discussed in the book concerning an uninitialized pointer can occur. More importantly, realloc() can be compromised and/or confused.
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